As a runner and cyclist I am compelled to tell you to be careful. It's possible your tight calfs are going to put a lot of strain of your Achilles tendons, and that's not an injury you want to PT. Give those pups a good and regular stretch, and do some eccentric heel drop stretches to protect your ATs. Youtube is your friend.
As far as riding contributing to calf problems, watch your foot position at the bottom of your stroke. Conventional wisdom is flat, not toe pointed down. Toe pointed down is said to cause calf problems, though I am not speaking as any expert on the subject.
Last edited by FrenchFit; 05-05-15 at 08:30 PM.